https://whiteprintnews.com/new-advances-in-the-field-of-nonlinear-optics-of-coordination-compounds/

Coordination polymers could be considered as successful optical materials. In the context of nonlinear optical properties, these materials have been thus far identified as useful for second order nonlinear optics mostly. Compounds with a acentric space groups are required for optical materials with nonlinearity of the second order type, seen as second-harmonic-generation property amongst others. These materials have received much attention due to a number of coexistent phenomena such as pyroelectricity, piezoelectricity and ferroelectricity.

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https://whiteprintnews.com/new-advances-in-the-field-of-nonlinear-optics-of-coordination-compounds/